Electrical regulating-switch



C. H. COLES.

ELECTRICAL REGULATING SWITCH. APPLICATION FILED DEC.15, 1919.

Patented Aug. 17,1920.

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CZarZeS Aaroid C cles TTOIQNEYS CHARLES HAROLD COLES, OF LONDON, ENGLAND.

ELECTRICAL REGULATING-SWITCH.

Specification of Letters Patent.

Patented Aug. .7, 1920.

Application filed December 15, 1919. Serial No. 345,129.

To all whom itmag concern:

Be it known that I, CHARLES HAROLD CoLns, subject of the King of Great Britain and Ireland, and resident of 46 Gerrard street, London, in the county of London, England, have invented a certain new and useful Improvement in Electrical Regulating-S\vitches, of which the following is a specification.

My invention relates to a new or improved regulating switch and is particularly adapted for use in connection with cinematograph projectors, especially in cases where duplicate machines are used, or where a single machine is used and the switchgear is also arranged to control the lighting circuit of the theater or similar locality.

The object of the invention consists in a new or improved arrangement whereby the amount of current switched on in either one or two arcs or in one are and the lighting circuit, is limited to a predetermined maximum.

According to the invention the switch arms for each set of resistances are arranged to move over the usual radially arranged contact studs, preferably disposed side by side or one above the other. These switch arms are connected by two hinged or pivoted connecting members, the inner ends of each of which are pivoted to one another, while their opposite ends are connected to the respective switch arms. The inner ends of each of the connecting members are provided with projecting portions or stops each arranged to engage the opposite member and thus limit the stroke or extent of rotation of either switch arm relatively to the other.

In order that the invention may be readily understood, reference is directed to the accompanying drawings, which show by way of example, a switch constructed according to the invention, in which Figures 1 and 2, are front elevations of part of a switch board showing the switch arms for the two sets of resistances in varying positions.

Fig. 3 is a part end elevation of Fi 2 seen from the left. a

The switch board 1 is provided with two sets of radially disposed contact studs 2, 2, connected in the usual manner to two sets of resistances (not shown in the drawings). Each set of contact studs is provided with a switch arm 3, 3 pivotally mounted on the sw tch board at 4, 4, respectively. The switch arm 3 has pivoted thereto at 5 one end of a connecting member 6 while the switch arm 3 has pivotally connected at 5 one end of a connecting member 6. The members 6 and 6" are connected at or near their inner ends by a pivot 7 or the like. The member 6 is provided at its extreme inner end with a rcarwardly projecting stop or the like 8 located in such a manner as to engage one edge or side of the member 6, while the member 6 is provided at its inner end with a forwardly projecting stop or the like 8 arranged to engage one edge of the 0pposite member 6. Each of the switch arms is provided with an operating handle 9, 9, secured at or near the front end of the rotatably mounted holders 10, 10*, respectively. A pair of stop pins 11 and 11 are arranged between the two series of contacts to prevent the switch arms being moved off the contacts.

The operation of the apparatus is as follows lVhen the switch arms 3, 3", are in the position shown in Fig. 1, both are in the zero position in which no current is passing through either of the resistances. If now it is desired to switch on the are or other electrical circuit connected with the contact studs .2, the switch arm 3 is rotated in an anti-clockwise direction, that is to the position shown in full lines in Fig. 2, in which position the maximum amount of current is switched on in one circuit while no current is passing in the other. If new it is desired to switch on the current in the circuit connected with the contact studs 2, the switch arm 3 will have to be rotated in a clockwise direction will be readily understood, The stops 8, 8, on the inner ends of the members 6, 6, are so arranged that the maximum movement of the switch arms is reached, when for instance, one arm is moved to the position in which the full current is allowed to pass and the opposite arm is in zero position. If the switch arm 3 is now rotated in a clockwise direction, the opposite arm 3 will be moved back toward its zero position, to a corresponding extent to which the switch arm 3 is advanced.

If it is desired to switch on full current in the circuit connected to the contact studs 2 the switch arms will assume the position shown in dotted lines in Fig. 2, in which the switch arm 3 is returned to its Zero position.

It will be readily understood that various modifications may be made in the constructional details or relative arrangement of parts without departing from the principle of the invention.

What I claim as my invention and desire to obtain by Letters Patent t- 1. in an electrical regulating switch, a pair of switch arms, two series of contacts over which the respective switch arms may he moved, a pair of bars, a pivotal. connection between one end of one bar to one switch arm and of the other bar to the other switch. arm and a pivotal connection between the free ends of the two bars.

2. In an electrical regulating switch, a

pair of switch arms, two series of contacts over which the respective switch arms may be moved, a pair of bars, a pivotal connec-' tion between one end oi one bar to one switch arm and or the other bar to the other switch arm and a pivotal connection beswitch arm and of the other bar to the other 1 switch arm and a pivotal'connection between the free ends of the two bars, and

projections located upon the pivotally connected inner ends of each of the two bars each adapted to engage against the edi s of the other bar to limit the'movement or the switch arms relatively to each other.

t. In an electrical regulating switch, a series of contacts arranged in arc formation. and a switch arm mounted upon a pivot at the center of this are, adapted to he turned so as to move over the contacts in turn, a second series of contacts and a second switch arm similarly arranged side by side, a bar pivoted to each switch arm and a pivotal connection between the free ends of the two bars. V

5. In an electrical regulating switch, a series o'l. contacts arranged in are formation and a switch arm mounted upon a pivot at the center of this are, adapted to he turned so to move over the contacts in turn, a second series ot contacts and a sec ond switch arm similarly arranged side by side, bar pivoted to each switch arm and a pivotal connection between the free ends of the two bars, and a stop upon the pivotally connected bars adapted to limit the maximum movement of either switch arm relatively to the other.

(3. in an electrical regulating switch, a series of: contacts arranged in arc formation and a switch arm mounted upon a pivot at the center of this are adapted to be turned so as to move over the contacts in turn, a

second series of contacts and a second switch arm similarly arranged side by side, a bar pivoted to each switch arm and a pivotal. connection between the free ends of the two hars'- and projections located upon the pivotally connected inner ends of each of the two bars each adapted to engage against the edge of the other liar to limit the movement of the switch arms relatively to each other.

7. In an electrical regulating switch, a series of contacts arranged in are formation and a switch arm mounted upon a pivot at the center of this are adapted to he turned so as to move over the cont cts in turn, a second series of contacts and a second switch arm similarly arranged side by side, a bar pivoted to each switch arm and a pivotal connection between the free ends of the two bars, and stops arranged between the series of contact against which. the switch arms may engage. a

8. In. an electrical regulating switch, a series of contacts arranged in arc formation and a switch arm mounted. upon a pivot at the center oi? this are adapted to be turned so as to move over the contacts in turn, a second series of contacts and a second switch arm, similarly arranged side by side, a bar pivoted to each switch arm and a pivotal connection between the free ends of the two bars, and a stop upon the pivotally connected bars adapted to limit the maximum movement of either switch arm relatively to the other, and stops arranged between the series of contacts against which the switch arms may engage. i

9. In an electrical regulating switch, a series of contacts arranged in arc forma tion and a switch arm mounted upon a pivot at the center of this are adapted to be turned so as to move over the contacts in turn, a second series of contacts and a second switch arm similarly arranged side by side, a bar pivoted to each switch arm and a pivotal connection bet veen the free ends of the two bars and projections located upon the pivotally connected inner ends. of each of the two bars adapted to engage against'the edge of the other bar to limit the movement of the switch arms relatively to each other, and stops arranged between the series of contacts against which the switch arms may enga "e. 

